Diving spiders have roughly circular bodies surrounded by outspread legs: 40 feet wide* and 10 feet high. *The number includes the spider's body and its legs; the actual body diameter is about a third of the total.

Some breeds of diving spider are adapted for an aquatic existence. Rather than constructing webs, they build submerged, air-filled domes of spidersilk where they lie in wait for prey to wander too close.

Diving spiders spend their lives underwater, except for brief trips to the surface to replenish air. The spider's furry body holds air bubbles that it releases into the dome. They are expert swimmers, unlike most spiders.

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